Hudson, who lost 70 pounds after her second pregnancy in 2011, now follows the Alkaline Diet, whose other celebrity proponents include Kelly Ripa and Elle Macpherson.

“Because I want to be as healthy as possible, I eat alkaline. That’s my go-to,” said Kate, 36. “It’s no dairy, it’s no wheat, it’s gluten-free, no meat and no sugar. I just cut all of that out. And no wine and no beer—only vodka and only tequila, straight up.”

Elle Macpherson and Kelly Ripa both follow the Alkaline Diet, which they say is anti-aging and promotes natural weight loss.

Kate, who loves to eat, said diet is critical for maintaining her flat abs and 70-pound weight loss, and said the Alkaline Diet is perfect for her.

“When you start to become more alkaline, it’s just basically healthier,” said Hudson. “Everything digests better, your blood is [at a proper pH balance].”

On the Alkaline Diet, people sometimes eat even more than they usually do. The theory behind the Alkaline Diet is that eating a diet high in alkaline-producing foods will minimize acid buildup in our bodies (which fuels inflammation, aging and weight gain).

When you ingest too many acidic foods, your pH levels get disrupted, causing weight gain and disease, said Dr. Stephan Domenig, author of The Alkaline Cure.